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author Robert McIntyre <rlm@mit.edu>
date Fri, 28 Oct 2011 00:03:05 -0700
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88 <h2>Table of Contents</h2>
89 <div id="text-table-of-contents">
90 <ul>
91 <li><a href="#sec-1">1 Tuples </a></li>
92 <li><a href="#sec-2">2 Generic arithmetic </a></li>
93 </ul>
94 </div>
95 </div>
97 <div id="outline-container-1" class="outline-2">
98 <h2 id="sec-1"><span class="section-number-2">1</span> Tuples </h2>
99 <div class="outline-text-2" id="text-1">
101 <ul>
102 <li>Tuples are a new data type: sequences with <i>spin</i>. A tuple can be either spin-up or spin-down.
103 </li>
104 <li>A pair of compatible tuples can be <b>contracted</b> into a single number.
105 <ul>
106 <li>Tuples are compatible if they have the same length and opposite
107 spin, and if their corresponding pairs of items are either both
108 numbers or both compatible tuples.
109 </li>
110 <li>To contract tuples, take the sum of the products of corresponding
111 pairs of items. (To take the product of compatible tuples,
112 contract them.)
113 </li>
114 </ul>
116 </li>
117 <li>
118 </li>
119 </ul>
122 </div>
124 </div>
126 <div id="outline-container-2" class="outline-2">
127 <h2 id="sec-2"><span class="section-number-2">2</span> Generic arithmetic </h2>
128 <div class="outline-text-2" id="text-2">
131 </div>
132 </div>
133 <div id="postamble">
134 <p class="date">Date: 2011-08-10 14:07:53 EDT</p>
135 <p class="author">Author: Robert McIntyre</p>
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